单选题A box of light bulbs contains exactly 3 light bulbs that are defective. What is the probability that a sample of light bulbs picked at random from this box will contain at least 1 defective light bulb
单选题When 29 of the votes on a certain resolution have been counted, 34 of those counted are in favor of tie resolution. What fraction of the remaining votes must be against the resolution so that the tota
单选题How many "+" added to the nine numbers below can make the result 99?Adjacent numbers can form a two-digit number123456789
单选题一把钥匙只能开一把锁，现有10把钥匙。10把锁，但是不知如何搭配，最多要试验多少次才能搭配好?
单选题If x, y and z are different positive integers less than 10, what is the greatest possible value of x-yz?
单选题In its search for new technologies for solar
单选题If Whitney wrote the decimal representations for the first 300 positive integer multiples of 5 and did not write any other numbers，how many times would she have written the digit 5?
单选题Is -3 x 3 ?1 x2 + y2 = 92 x2 + y9
单选题If s is an integer, is 24 a divisor of s ?1 Each of the numbers 3 and 8 is a divisor of s. 2 Each of the numbers 4 and 6 is a divisor of s.
单选题Most scholars agree that King Alfred (A.D.
单选题If k is an even integer and p and r are odd integers, which of the following CANNOT be all integer?
单选题Exactly 3 deposits have been made in a savings account and the amounts of the deposits are 3 consecutive integer multiples of $7. If the sum of the deposits is between $120 and $170, what is the amoun
单选题What’s the median of 3，4，5，1，10，4，7，8?
单选题Is x positive?1x2-1=02x3+1=0
单选题If C is the temperature in degrees Celsius and F is the temperature in degrees Fahrenheit，then the relationship between temperatures on the two scales is expressed by the equation 9C=5F-32．On a day wh
单选题If x ≥ 9 and y≤5, then it must be true that
单选题Is x equal to 1?1x2=12x2-x-2=0
单选题从序列{-2，-1，0，1，2}中任选两数，这两个数可以相等，求两个数和为零的概率?
单选题Select one number from the set {0, 1, 2, 3, 4, 5, 6, 7, 8, 9}, take down its value and then put it back. Select one number from the set again and also take down its value. If the sum of the two values